![Nishanth Aravamudan](/assets/img/avatar_default.png)
Use schedule_timeout_interruptible() instead of set_current_state()/schedule_timeout() to reduce kernel size. Also use human-time conversion functions instead of hard-coded HZ division to avoid rounding errors. Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2010 lines
61 KiB
C
2010 lines
61 KiB
C
/*
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* arch/ppc/4xx_io/serial_sicc.c
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*
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* Driver for IBM STB3xxx SICC serial port
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*
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* Based on drivers/char/serial_amba.c, by ARM Ltd.
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*
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* Copyright 2001 IBM Crop.
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* Author: IBM China Research Lab
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* Yudong Yang <yangyud@cn.ibm.com>
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* Yi Ge <geyi@cn.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* This is a driver for SICC serial port on IBM Redwood 4 evaluation board.
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* The driver support both as a console device and normal serial device and
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* is compatible with normal ttyS* devices.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/circ_buf.h>
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#include <linux/serial.h>
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#include <linux/console.h>
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#include <linux/sysrq.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/serial.h>
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#include <linux/serialP.h>
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/* -----------------------------------------------------------------------------
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* From STB03xxx SICC UART Specification
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* -----------------------------------------------------------------------------
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* UART Register Offsets.
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*/
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#define BL_SICC_LSR 0x0000000 /* line status register read/clear */
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#define BL_SICC_LSRS 0x0000001 /* set line status register read/set */
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#define BL_SICC_HSR 0x0000002 /* handshake status register r/clear */
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#define BL_SICC_HSRS 0x0000003 /* set handshake status register r/set */
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#define BL_SICC_BRDH 0x0000004 /* baudrate divisor high reg r/w */
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#define BL_SICC_BRDL 0x0000005 /* baudrate divisor low reg r/w */
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#define BL_SICC_LCR 0x0000006 /* control register r/w */
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#define BL_SICC_RCR 0x0000007 /* receiver command register r/w */
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#define BL_SICC_TxCR 0x0000008 /* transmitter command register r/w */
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#define BL_SICC_RBR 0x0000009 /* receive buffer r */
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#define BL_SICC_TBR 0x0000009 /* transmit buffer w */
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#define BL_SICC_CTL2 0x000000A /* added for Vesta */
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#define BL_SICC_IrCR 0x000000B /* added for Vesta IR */
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/* masks and definitions for serial port control register */
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#define _LCR_LM_MASK 0xc0 /* loop back modes */
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#define _LCR_DTR_MASK 0x20 /* data terminal ready 0-inactive */
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#define _LCR_RTS_MASK 0x10 /* request to send 0-inactive */
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#define _LCR_DB_MASK 0x08 /* data bits mask */
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#define _LCR_PE_MASK 0x04 /* parity enable */
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#define _LCR_PTY_MASK 0x02 /* parity */
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#define _LCR_SB_MASK 0x01 /* stop bit mask */
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#define _LCR_LM_NORM 0x00 /* normal operation */
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#define _LCR_LM_LOOP 0x40 /* internal loopback mode */
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#define _LCR_LM_ECHO 0x80 /* automatic echo mode */
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#define _LCR_LM_RES 0xc0 /* reserved */
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#define _LCR_DTR_ACTIVE _LCR_DTR_MASK /* DTR is active */
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#define _LCR_RTS_ACTIVE _LCR_RTS_MASK /* RTS is active */
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#define _LCR_DB_8_BITS _LCR_DB_MASK /* 8 data bits */
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#define _LCR_DB_7_BITS 0x00 /* 7 data bits */
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#define _LCR_PE_ENABLE _LCR_PE_MASK /* parity enabled */
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#define _LCR_PE_DISABLE 0x00 /* parity disabled */
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#define _LCR_PTY_EVEN 0x00 /* even parity */
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#define _LCR_PTY_ODD _LCR_PTY_MASK /* odd parity */
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#define _LCR_SB_1_BIT 0x00 /* one stop bit */
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#define _LCR_SB_2_BIT _LCR_SB_MASK /* two stop bit */
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/* serial port handshake register */
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#define _HSR_DIS_MASK 0x80 /* DSR input inactive error mask */
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#define _HSR_CS_MASK 0x40 /* CTS input inactive error mask */
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#define _HSR_DIS_ACT 0x00 /* dsr input is active */
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#define _HSR_DIS_INACT _HSR_DIS_MASK /* dsr input is inactive */
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#define _HSR_CS_ACT 0x00 /* cts input is active */
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#define _HSR_CS_INACT _HSR_CS_MASK /* cts input is active */
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/* serial port line status register */
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#define _LSR_RBR_MASK 0x80 /* receive buffer ready mask */
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#define _LSR_FE_MASK 0x40 /* framing error */
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#define _LSR_OE_MASK 0x20 /* overrun error */
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#define _LSR_PE_MASK 0x10 /* parity error */
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#define _LSR_LB_MASK 0x08 /* line break */
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#define _LSR_TBR_MASK 0x04 /* transmit buffer ready */
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#define _LSR_TSR_MASK 0x02 /* transmit shift register ready */
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#define _LSR_RBR_FULL _LSR_RBR_MASK /* receive buffer is full */
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#define _LSR_FE_ERROR _LSR_FE_MASK /* framing error detected */
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#define _LSR_OE_ERROR _LSR_OE_MASK /* overrun error detected */
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#define _LSR_PE_ERROR _LSR_PE_MASK /* parity error detected */
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#define _LSR_LB_BREAK _LSR_LB_MASK /* line break detected */
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#define _LSR_TBR_EMPTY _LSR_TBR_MASK /* transmit buffer is ready */
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#define _LSR_TSR_EMPTY _LSR_TSR_MASK /* transmit shift register is empty */
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#define _LSR_TX_ALL 0x06 /* all physical transmit is done */
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#define _LSR_RX_ERR (_LSR_LB_BREAK | _LSR_FE_MASK | _LSR_OE_MASK | \
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_LSR_PE_MASK )
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/* serial port receiver command register */
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#define _RCR_ER_MASK 0x80 /* enable receiver mask */
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#define _RCR_DME_MASK 0x60 /* dma mode */
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#define _RCR_EIE_MASK 0x10 /* error interrupt enable mask */
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#define _RCR_PME_MASK 0x08 /* pause mode mask */
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#define _RCR_ER_ENABLE _RCR_ER_MASK /* receiver enabled */
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#define _RCR_DME_DISABLE 0x00 /* dma disabled */
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#define _RCR_DME_RXRDY 0x20 /* dma disabled, RxRDY interrupt enabled*/
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#define _RCR_DME_ENABLE2 0x40 /* dma enabled,receiver src channel 2 */
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#define _RCR_DME_ENABLE3 0x60 /* dma enabled,receiver src channel 3 */
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#define _RCR_PME_HARD _RCR_PME_MASK /* RTS controlled by hardware */
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#define _RCR_PME_SOFT 0x00 /* RTS controlled by software */
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/* serial port transmit command register */
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#define _TxCR_ET_MASK 0x80 /* transmiter enable mask */
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#define _TxCR_DME_MASK 0x60 /* dma mode mask */
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#define _TxCR_TIE_MASK 0x10 /* empty interrupt enable mask */
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#define _TxCR_EIE_MASK 0x08 /* error interrupt enable mask */
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#define _TxCR_SPE_MASK 0x04 /* stop/pause mask */
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#define _TxCR_TB_MASK 0x02 /* transmit break mask */
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#define _TxCR_ET_ENABLE _TxCR_ET_MASK /* transmiter enabled */
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#define _TxCR_DME_DISABLE 0x00 /* transmiter disabled, TBR intr disabled */
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#define _TxCR_DME_TBR 0x20 /* transmiter disabled, TBR intr enabled */
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#define _TxCR_DME_CHAN_2 0x40 /* dma enabled, destination chann 2 */
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#define _TxCR_DME_CHAN_3 0x60 /* dma enabled, destination chann 3 */
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/* serial ctl reg 2 - added for Vesta */
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#define _CTL2_EXTERN 0x80 /* */
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#define _CTL2_USEFIFO 0x40 /* */
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#define _CTL2_RESETRF 0x08 /* */
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#define _CTL2_RESETTF 0x04 /* */
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#define SERIAL_SICC_NAME "ttySICC"
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#define SERIAL_SICC_MAJOR 150
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#define SERIAL_SICC_MINOR 1
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#define SERIAL_SICC_NR 1
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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/*
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* Things needed by tty driver
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*/
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static struct tty_driver *siccnormal_driver;
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#if defined(CONFIG_SERIAL_SICC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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#define SUPPORT_SYSRQ
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#endif
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/*
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* Things needed internally to this driver
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*/
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/*
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* tmp_buf is used as a temporary buffer by serial_write. We need to
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* lock it in case the copy_from_user blocks while swapping in a page,
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* and some other program tries to do a serial write at the same time.
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* Since the lock will only come under contention when the system is
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* swapping and available memory is low, it makes sense to share one
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* buffer across all the serial ports, since it significantly saves
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* memory if large numbers of serial ports are open.
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*/
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static u_char *tmp_buf;
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static DECLARE_MUTEX(tmp_buf_sem);
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#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
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/* number of characters left in xmit buffer before we ask for more */
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#define WAKEUP_CHARS 256
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#define SICC_ISR_PASS_LIMIT 256
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#define EVT_WRITE_WAKEUP 0
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struct SICC_icount {
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__u32 cts;
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__u32 dsr;
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__u32 rng;
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__u32 dcd;
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__u32 rx;
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__u32 tx;
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__u32 frame;
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__u32 overrun;
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__u32 parity;
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__u32 brk;
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__u32 buf_overrun;
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};
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/*
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* Static information about the port
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*/
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struct SICC_port {
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unsigned int uart_base;
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unsigned int uart_base_phys;
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unsigned int irqrx;
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unsigned int irqtx;
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unsigned int uartclk;
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unsigned int fifosize;
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unsigned int tiocm_support;
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void (*set_mctrl)(struct SICC_port *, u_int mctrl);
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};
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/*
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* This is the state information which is persistent across opens
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*/
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struct SICC_state {
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struct SICC_icount icount;
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unsigned int line;
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unsigned int close_delay;
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unsigned int closing_wait;
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unsigned int custom_divisor;
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unsigned int flags;
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int count;
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struct SICC_info *info;
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spinlock_t sicc_lock;
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};
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#define SICC_XMIT_SIZE 1024
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/*
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* This is the state information which is only valid when the port is open.
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*/
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struct SICC_info {
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struct SICC_port *port;
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struct SICC_state *state;
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struct tty_struct *tty;
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unsigned char x_char;
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unsigned char old_status;
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unsigned char read_status_mask;
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unsigned char ignore_status_mask;
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struct circ_buf xmit;
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unsigned int flags;
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#ifdef SUPPORT_SYSRQ
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unsigned long sysrq;
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#endif
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unsigned int event;
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unsigned int timeout;
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unsigned int lcr_h;
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unsigned int mctrl;
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int blocked_open;
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struct tasklet_struct tlet;
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wait_queue_head_t open_wait;
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wait_queue_head_t close_wait;
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wait_queue_head_t delta_msr_wait;
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};
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#ifdef CONFIG_SERIAL_SICC_CONSOLE
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static struct console siccuart_cons;
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#endif
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static void siccuart_change_speed(struct SICC_info *info, struct termios *old_termios);
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static void siccuart_wait_until_sent(struct tty_struct *tty, int timeout);
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static void powerpcMtcic_cr(unsigned long value)
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{
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mtdcr(DCRN_CICCR, value);
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}
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static unsigned long powerpcMfcic_cr(void)
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{
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return mfdcr(DCRN_CICCR);
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}
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static unsigned long powerpcMfclkgpcr(void)
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{
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return mfdcr(DCRN_SCCR);
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}
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static void sicc_set_mctrl_null(struct SICC_port *port, u_int mctrl)
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{
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}
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static struct SICC_port sicc_ports[SERIAL_SICC_NR] = {
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{
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.uart_base = 0,
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.uart_base_phys = SICC0_IO_BASE,
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.irqrx = SICC0_INTRX,
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.irqtx = SICC0_INTTX,
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// .uartclk = 0,
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.fifosize = 1,
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.set_mctrl = sicc_set_mctrl_null,
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}
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};
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static struct SICC_state sicc_state[SERIAL_SICC_NR];
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static void siccuart_enable_rx_interrupt(struct SICC_info *info)
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{
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unsigned char cr;
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cr = readb(info->port->uart_base+BL_SICC_RCR);
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cr &= ~_RCR_DME_MASK;
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cr |= _RCR_DME_RXRDY;
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writeb(cr, info->port->uart_base+BL_SICC_RCR);
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}
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static void siccuart_disable_rx_interrupt(struct SICC_info *info)
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{
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unsigned char cr;
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cr = readb(info->port->uart_base+BL_SICC_RCR);
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cr &= ~_RCR_DME_MASK;
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cr |= _RCR_DME_DISABLE;
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writeb(cr, info->port->uart_base+BL_SICC_RCR);
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}
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static void siccuart_enable_tx_interrupt(struct SICC_info *info)
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{
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unsigned char cr;
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cr = readb(info->port->uart_base+BL_SICC_TxCR);
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cr &= ~_TxCR_DME_MASK;
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cr |= _TxCR_DME_TBR;
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writeb(cr, info->port->uart_base+BL_SICC_TxCR);
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}
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static void siccuart_disable_tx_interrupt(struct SICC_info *info)
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{
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unsigned char cr;
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cr = readb(info->port->uart_base+BL_SICC_TxCR);
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cr &= ~_TxCR_DME_MASK;
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cr |= _TxCR_DME_DISABLE;
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writeb(cr, info->port->uart_base+BL_SICC_TxCR);
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}
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static void siccuart_stop(struct tty_struct *tty)
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{
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struct SICC_info *info = tty->driver_data;
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unsigned long flags;
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/* disable interrupts while stopping serial port interrupts */
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spin_lock_irqsave(&info->state->sicc_lock,flags);
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siccuart_disable_tx_interrupt(info);
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spin_unlock_irqrestore(&info->state->sicc_lock,flags);
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}
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static void siccuart_start(struct tty_struct *tty)
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{
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struct SICC_info *info = tty->driver_data;
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unsigned long flags;
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/* disable interrupts while starting serial port interrupts */
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spin_lock_irqsave(&info->state->sicc_lock,flags);
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if (info->xmit.head != info->xmit.tail
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&& info->xmit.buf)
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siccuart_enable_tx_interrupt(info);
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spin_unlock_irqrestore(&info->state->sicc_lock,flags);
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}
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/*
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* This routine is used by the interrupt handler to schedule
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* processing in the software interrupt portion of the driver.
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*/
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static void siccuart_event(struct SICC_info *info, int event)
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{
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info->event |= 1 << event;
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tasklet_schedule(&info->tlet);
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}
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static void
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siccuart_rx_chars(struct SICC_info *info, struct pt_regs *regs)
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{
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struct tty_struct *tty = info->tty;
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unsigned int status, ch, rsr, flg, ignored = 0;
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struct SICC_icount *icount = &info->state->icount;
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struct SICC_port *port = info->port;
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status = readb(port->uart_base+BL_SICC_LSR );
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while (status & _LSR_RBR_FULL) {
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ch = readb(port->uart_base+BL_SICC_RBR);
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if (tty->flip.count >= TTY_FLIPBUF_SIZE)
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goto ignore_char;
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icount->rx++;
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flg = TTY_NORMAL;
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/*
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* Note that the error handling code is
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* out of the main execution path
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*/
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rsr = readb(port->uart_base+BL_SICC_LSR);
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if (rsr & _LSR_RX_ERR)
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goto handle_error;
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#ifdef SUPPORT_SYSRQ
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if (info->sysrq) {
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if (ch && time_before(jiffies, info->sysrq)) {
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handle_sysrq(ch, regs, NULL);
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info->sysrq = 0;
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goto ignore_char;
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}
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info->sysrq = 0;
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}
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#endif
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error_return:
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*tty->flip.flag_buf_ptr++ = flg;
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*tty->flip.char_buf_ptr++ = ch;
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tty->flip.count++;
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ignore_char:
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status = readb(port->uart_base+BL_SICC_LSR );
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}
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out:
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tty_flip_buffer_push(tty);
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return;
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handle_error:
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if (rsr & _LSR_LB_BREAK) {
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rsr &= ~(_LSR_FE_MASK | _LSR_PE_MASK);
|
|
icount->brk++;
|
|
|
|
#ifdef SUPPORT_SYSRQ
|
|
if (info->state->line == siccuart_cons.index) {
|
|
if (!info->sysrq) {
|
|
info->sysrq = jiffies + HZ*5;
|
|
goto ignore_char;
|
|
}
|
|
}
|
|
#endif
|
|
} else if (rsr & _LSR_PE_MASK)
|
|
icount->parity++;
|
|
else if (rsr & _LSR_FE_MASK)
|
|
icount->frame++;
|
|
if (rsr & _LSR_OE_MASK)
|
|
icount->overrun++;
|
|
|
|
if (rsr & info->ignore_status_mask) {
|
|
if (++ignored > 100)
|
|
goto out;
|
|
goto ignore_char;
|
|
}
|
|
rsr &= info->read_status_mask;
|
|
|
|
if (rsr & _LSR_LB_BREAK)
|
|
flg = TTY_BREAK;
|
|
else if (rsr & _LSR_PE_MASK)
|
|
flg = TTY_PARITY;
|
|
else if (rsr & _LSR_FE_MASK)
|
|
flg = TTY_FRAME;
|
|
|
|
if (rsr & _LSR_OE_MASK) {
|
|
/*
|
|
* CHECK: does overrun affect the current character?
|
|
* ASSUMPTION: it does not.
|
|
*/
|
|
*tty->flip.flag_buf_ptr++ = flg;
|
|
*tty->flip.char_buf_ptr++ = ch;
|
|
tty->flip.count++;
|
|
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
|
|
goto ignore_char;
|
|
ch = 0;
|
|
flg = TTY_OVERRUN;
|
|
}
|
|
#ifdef SUPPORT_SYSRQ
|
|
info->sysrq = 0;
|
|
#endif
|
|
goto error_return;
|
|
}
|
|
|
|
static void siccuart_tx_chars(struct SICC_info *info)
|
|
{
|
|
struct SICC_port *port = info->port;
|
|
int count;
|
|
unsigned char status;
|
|
|
|
|
|
if (info->x_char) {
|
|
writeb(info->x_char, port->uart_base+ BL_SICC_TBR);
|
|
info->state->icount.tx++;
|
|
info->x_char = 0;
|
|
return;
|
|
}
|
|
if (info->xmit.head == info->xmit.tail
|
|
|| info->tty->stopped
|
|
|| info->tty->hw_stopped) {
|
|
siccuart_disable_tx_interrupt(info);
|
|
writeb(status&(~_LSR_RBR_MASK),port->uart_base+BL_SICC_LSR);
|
|
return;
|
|
}
|
|
|
|
count = port->fifosize;
|
|
do {
|
|
writeb(info->xmit.buf[info->xmit.tail], port->uart_base+ BL_SICC_TBR);
|
|
info->xmit.tail = (info->xmit.tail + 1) & (SICC_XMIT_SIZE - 1);
|
|
info->state->icount.tx++;
|
|
if (info->xmit.head == info->xmit.tail)
|
|
break;
|
|
} while (--count > 0);
|
|
|
|
if (CIRC_CNT(info->xmit.head,
|
|
info->xmit.tail,
|
|
SICC_XMIT_SIZE) < WAKEUP_CHARS)
|
|
siccuart_event(info, EVT_WRITE_WAKEUP);
|
|
|
|
if (info->xmit.head == info->xmit.tail) {
|
|
siccuart_disable_tx_interrupt(info);
|
|
}
|
|
}
|
|
|
|
|
|
static irqreturn_t siccuart_int_rx(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
struct SICC_info *info = dev_id;
|
|
siccuart_rx_chars(info, regs);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
static irqreturn_t siccuart_int_tx(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
struct SICC_info *info = dev_id;
|
|
siccuart_tx_chars(info);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void siccuart_tasklet_action(unsigned long data)
|
|
{
|
|
struct SICC_info *info = (struct SICC_info *)data;
|
|
struct tty_struct *tty;
|
|
|
|
tty = info->tty;
|
|
if (!tty || !test_and_clear_bit(EVT_WRITE_WAKEUP, &info->event))
|
|
return;
|
|
|
|
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
|
|
tty->ldisc.write_wakeup)
|
|
(tty->ldisc.write_wakeup)(tty);
|
|
wake_up_interruptible(&tty->write_wait);
|
|
}
|
|
|
|
static int siccuart_startup(struct SICC_info *info)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long page;
|
|
int retval = 0;
|
|
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
|
return 0;
|
|
}
|
|
|
|
page = get_zeroed_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
if (info->port->uart_base == 0)
|
|
info->port->uart_base = (int)ioremap(info->port->uart_base_phys, PAGE_SIZE);
|
|
if (info->port->uart_base == 0) {
|
|
free_page(page);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* lock access to info while doing setup */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
|
|
if (info->xmit.buf)
|
|
free_page(page);
|
|
else
|
|
info->xmit.buf = (unsigned char *) page;
|
|
|
|
|
|
info->mctrl = 0;
|
|
if (info->tty->termios->c_cflag & CBAUD)
|
|
info->mctrl = TIOCM_RTS | TIOCM_DTR;
|
|
info->port->set_mctrl(info->port, info->mctrl);
|
|
|
|
/*
|
|
* initialise the old status of the modem signals
|
|
*/
|
|
info->old_status = 0; // UART_GET_FR(info->port) & AMBA_UARTFR_MODEM_ANY;
|
|
|
|
|
|
if (info->tty)
|
|
clear_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
info->xmit.head = info->xmit.tail = 0;
|
|
|
|
/*
|
|
* Set up the tty->alt_speed kludge
|
|
*/
|
|
if (info->tty) {
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
|
info->tty->alt_speed = 57600;
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
|
info->tty->alt_speed = 115200;
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
|
info->tty->alt_speed = 230400;
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
|
info->tty->alt_speed = 460800;
|
|
}
|
|
|
|
|
|
writeb( 0x00, info->port->uart_base + BL_SICC_IrCR ); // disable IrDA
|
|
|
|
|
|
/*
|
|
* and set the speed of the serial port
|
|
*/
|
|
siccuart_change_speed(info, 0);
|
|
|
|
// enable rx/tx ports
|
|
writeb(_RCR_ER_ENABLE /*| _RCR_PME_HARD*/, info->port->uart_base + BL_SICC_RCR);
|
|
writeb(_TxCR_ET_ENABLE , info->port->uart_base + BL_SICC_TxCR);
|
|
|
|
readb(info->port->uart_base + BL_SICC_RBR); // clear rx port
|
|
|
|
writeb(0xf8, info->port->uart_base + BL_SICC_LSR); /* reset bits 0-4 of LSR */
|
|
|
|
/*
|
|
* Finally, enable interrupts
|
|
*/
|
|
|
|
/*
|
|
* Allocate the IRQ
|
|
*/
|
|
retval = request_irq(info->port->irqrx, siccuart_int_rx, 0, "SICC rx", info);
|
|
if (retval) {
|
|
if (capable(CAP_SYS_ADMIN)) {
|
|
if (info->tty)
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
retval = 0;
|
|
}
|
|
goto errout;
|
|
}
|
|
retval = request_irq(info->port->irqtx, siccuart_int_tx, 0, "SICC tx", info);
|
|
if (retval) {
|
|
if (capable(CAP_SYS_ADMIN)) {
|
|
if (info->tty)
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
retval = 0;
|
|
}
|
|
free_irq(info->port->irqrx, info);
|
|
goto errout;
|
|
}
|
|
|
|
siccuart_enable_rx_interrupt(info);
|
|
|
|
info->flags |= ASYNC_INITIALIZED;
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
return 0;
|
|
|
|
|
|
errout:
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* This routine will shutdown a serial port; interrupts are disabled, and
|
|
* DTR is dropped if the hangup on close termio flag is on.
|
|
*/
|
|
static void siccuart_shutdown(struct SICC_info *info)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!(info->flags & ASYNC_INITIALIZED))
|
|
return;
|
|
|
|
/* lock while shutting down port */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags); /* Disable interrupts */
|
|
|
|
/*
|
|
* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
|
|
* here so the queue might never be woken up
|
|
*/
|
|
wake_up_interruptible(&info->delta_msr_wait);
|
|
|
|
/*
|
|
* disable all interrupts, disable the port
|
|
*/
|
|
siccuart_disable_rx_interrupt(info);
|
|
siccuart_disable_tx_interrupt(info);
|
|
|
|
/*
|
|
* Free the IRQ
|
|
*/
|
|
free_irq(info->port->irqtx, info);
|
|
free_irq(info->port->irqrx, info);
|
|
|
|
if (info->xmit.buf) {
|
|
unsigned long pg = (unsigned long) info->xmit.buf;
|
|
info->xmit.buf = NULL;
|
|
free_page(pg);
|
|
}
|
|
|
|
|
|
if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
|
|
info->mctrl &= ~(TIOCM_DTR|TIOCM_RTS);
|
|
info->port->set_mctrl(info->port, info->mctrl);
|
|
|
|
/* kill off our tasklet */
|
|
tasklet_kill(&info->tlet);
|
|
if (info->tty)
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
|
|
info->flags &= ~ASYNC_INITIALIZED;
|
|
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
}
|
|
|
|
|
|
static void siccuart_change_speed(struct SICC_info *info, struct termios *old_termios)
|
|
{
|
|
unsigned int lcr_h, baud, quot, cflag, old_rcr, old_tcr, bits;
|
|
unsigned long flags;
|
|
|
|
if (!info->tty || !info->tty->termios)
|
|
return;
|
|
|
|
cflag = info->tty->termios->c_cflag;
|
|
|
|
pr_debug("siccuart_set_cflag(0x%x) called\n", cflag);
|
|
/* byte size and parity */
|
|
switch (cflag & CSIZE) {
|
|
case CS7: lcr_h = _LCR_PE_DISABLE | _LCR_DB_7_BITS | _LCR_SB_1_BIT; bits = 9; break;
|
|
default: lcr_h = _LCR_PE_DISABLE | _LCR_DB_8_BITS | _LCR_SB_1_BIT; bits = 10; break; // CS8
|
|
}
|
|
if (cflag & CSTOPB) {
|
|
lcr_h |= _LCR_SB_2_BIT;
|
|
bits ++;
|
|
}
|
|
if (cflag & PARENB) {
|
|
lcr_h |= _LCR_PE_ENABLE;
|
|
bits++;
|
|
if (!(cflag & PARODD))
|
|
lcr_h |= _LCR_PTY_ODD;
|
|
else
|
|
lcr_h |= _LCR_PTY_EVEN;
|
|
}
|
|
|
|
do {
|
|
/* Determine divisor based on baud rate */
|
|
baud = tty_get_baud_rate(info->tty);
|
|
if (!baud)
|
|
baud = 9600;
|
|
|
|
|
|
{
|
|
// here is ppc403SetBaud(com_port, baud);
|
|
unsigned long divisor, clockSource, temp;
|
|
|
|
/* Ensure CICCR[7] is 0 to select Internal Baud Clock */
|
|
powerpcMtcic_cr((unsigned long)(powerpcMfcic_cr() & 0xFEFFFFFF));
|
|
|
|
/* Determine Internal Baud Clock Frequency */
|
|
/* powerpcMfclkgpcr() reads DCR 0x120 - the*/
|
|
/* SCCR (Serial Clock Control Register) on Vesta */
|
|
temp = powerpcMfclkgpcr();
|
|
|
|
if(temp & 0x00000080) {
|
|
clockSource = 324000000;
|
|
}
|
|
else {
|
|
clockSource = 216000000;
|
|
}
|
|
clockSource = clockSource/(unsigned long)((temp&0x00FC0000)>>18);
|
|
divisor = clockSource/(16*baud) - 1;
|
|
/* divisor has only 12 bits of resolution */
|
|
if(divisor>0x00000FFF){
|
|
divisor=0x00000FFF;
|
|
}
|
|
|
|
quot = divisor;
|
|
}
|
|
|
|
if (baud == 38400 &&
|
|
((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
|
|
quot = info->state->custom_divisor;
|
|
|
|
if (!quot && old_termios) {
|
|
info->tty->termios->c_cflag &= ~CBAUD;
|
|
info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
|
|
old_termios = NULL;
|
|
}
|
|
} while (quot == 0 && old_termios);
|
|
|
|
/* As a last resort, if the quotient is zero, default to 9600 bps */
|
|
if (!quot)
|
|
quot = (info->port->uartclk / (16 * 9600)) - 1;
|
|
|
|
info->timeout = info->port->fifosize * HZ * bits / baud;
|
|
info->timeout += HZ/50; /* Add .02 seconds of slop */
|
|
|
|
if (cflag & CRTSCTS)
|
|
info->flags |= ASYNC_CTS_FLOW;
|
|
else
|
|
info->flags &= ~ASYNC_CTS_FLOW;
|
|
if (cflag & CLOCAL)
|
|
info->flags &= ~ASYNC_CHECK_CD;
|
|
else
|
|
info->flags |= ASYNC_CHECK_CD;
|
|
|
|
/*
|
|
* Set up parity check flag
|
|
*/
|
|
#define RELEVENT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
|
|
|
|
info->read_status_mask = _LSR_OE_MASK;
|
|
if (I_INPCK(info->tty))
|
|
info->read_status_mask |= _LSR_FE_MASK | _LSR_PE_MASK;
|
|
if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
|
|
info->read_status_mask |= _LSR_LB_MASK;
|
|
|
|
/*
|
|
* Characters to ignore
|
|
*/
|
|
info->ignore_status_mask = 0;
|
|
if (I_IGNPAR(info->tty))
|
|
info->ignore_status_mask |= _LSR_FE_MASK | _LSR_PE_MASK;
|
|
if (I_IGNBRK(info->tty)) {
|
|
info->ignore_status_mask |= _LSR_LB_MASK;
|
|
/*
|
|
* If we're ignoring parity and break indicators,
|
|
* ignore overruns to (for real raw support).
|
|
*/
|
|
if (I_IGNPAR(info->tty))
|
|
info->ignore_status_mask |= _LSR_OE_MASK;
|
|
}
|
|
|
|
/* disable interrupts while reading and clearing registers */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
|
|
old_rcr = readb(info->port->uart_base + BL_SICC_RCR);
|
|
old_tcr = readb(info->port->uart_base + BL_SICC_TxCR);
|
|
|
|
|
|
writeb(0, info->port->uart_base + BL_SICC_RCR);
|
|
writeb(0, info->port->uart_base + BL_SICC_TxCR);
|
|
|
|
/*RLBtrace (&ppc403Chan0, 0x2000000c, 0, 0);*/
|
|
|
|
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
|
|
|
|
/* Set baud rate */
|
|
writeb((quot & 0x00000F00)>>8, info->port->uart_base + BL_SICC_BRDH );
|
|
writeb( quot & 0x00000FF, info->port->uart_base + BL_SICC_BRDL );
|
|
|
|
/* Set CTL2 reg to use external clock (ExtClk) and enable FIFOs. */
|
|
/* For now, do NOT use FIFOs since 403 UART did not have this */
|
|
/* capability and this driver was inherited from 403UART. */
|
|
writeb(_CTL2_EXTERN, info->port->uart_base + BL_SICC_CTL2);
|
|
|
|
writeb(lcr_h, info->port->uart_base + BL_SICC_LCR);
|
|
|
|
writeb(old_rcr, info->port->uart_base + BL_SICC_RCR); // restore rcr
|
|
writeb(old_tcr, info->port->uart_base + BL_SICC_TxCR); // restore txcr
|
|
|
|
}
|
|
|
|
|
|
static void siccuart_put_char(struct tty_struct *tty, u_char ch)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (!tty || !info->xmit.buf)
|
|
return;
|
|
|
|
/* lock info->xmit while adding character to tx buffer */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SICC_XMIT_SIZE) != 0) {
|
|
info->xmit.buf[info->xmit.head] = ch;
|
|
info->xmit.head = (info->xmit.head + 1) & (SICC_XMIT_SIZE - 1);
|
|
}
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
}
|
|
|
|
static void siccuart_flush_chars(struct tty_struct *tty)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (info->xmit.head == info->xmit.tail
|
|
|| tty->stopped
|
|
|| tty->hw_stopped
|
|
|| !info->xmit.buf)
|
|
return;
|
|
|
|
/* disable interrupts while transmitting characters */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
siccuart_enable_tx_interrupt(info);
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
}
|
|
|
|
static int siccuart_write(struct tty_struct *tty,
|
|
const u_char * buf, int count)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
unsigned long flags;
|
|
int c, ret = 0;
|
|
|
|
if (!tty || !info->xmit.buf || !tmp_buf)
|
|
return 0;
|
|
|
|
/* lock info->xmit while removing characters from buffer */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
while (1) {
|
|
c = CIRC_SPACE_TO_END(info->xmit.head,
|
|
info->xmit.tail,
|
|
SICC_XMIT_SIZE);
|
|
if (count < c)
|
|
c = count;
|
|
if (c <= 0)
|
|
break;
|
|
memcpy(info->xmit.buf + info->xmit.head, buf, c);
|
|
info->xmit.head = (info->xmit.head + c) &
|
|
(SICC_XMIT_SIZE - 1);
|
|
buf += c;
|
|
count -= c;
|
|
ret += c;
|
|
}
|
|
if (info->xmit.head != info->xmit.tail
|
|
&& !tty->stopped
|
|
&& !tty->hw_stopped)
|
|
siccuart_enable_tx_interrupt(info);
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
return ret;
|
|
}
|
|
|
|
static int siccuart_write_room(struct tty_struct *tty)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
|
|
return CIRC_SPACE(info->xmit.head, info->xmit.tail, SICC_XMIT_SIZE);
|
|
}
|
|
|
|
static int siccuart_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
|
|
return CIRC_CNT(info->xmit.head, info->xmit.tail, SICC_XMIT_SIZE);
|
|
}
|
|
|
|
static void siccuart_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
pr_debug("siccuart_flush_buffer(%d) called\n", tty->index);
|
|
/* lock info->xmit while zeroing buffer counts */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
info->xmit.head = info->xmit.tail = 0;
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
wake_up_interruptible(&tty->write_wait);
|
|
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
|
|
tty->ldisc.write_wakeup)
|
|
(tty->ldisc.write_wakeup)(tty);
|
|
}
|
|
|
|
/*
|
|
* This function is used to send a high-priority XON/XOFF character to
|
|
* the device
|
|
*/
|
|
static void siccuart_send_xchar(struct tty_struct *tty, char ch)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
|
|
info->x_char = ch;
|
|
if (ch)
|
|
siccuart_enable_tx_interrupt(info);
|
|
}
|
|
|
|
static void siccuart_throttle(struct tty_struct *tty)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (I_IXOFF(tty))
|
|
siccuart_send_xchar(tty, STOP_CHAR(tty));
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS) {
|
|
/* disable interrupts while setting modem control lines */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
info->mctrl &= ~TIOCM_RTS;
|
|
info->port->set_mctrl(info->port, info->mctrl);
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
}
|
|
}
|
|
|
|
static void siccuart_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct SICC_info *info = (struct SICC_info *) tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
if (info->x_char)
|
|
info->x_char = 0;
|
|
else
|
|
siccuart_send_xchar(tty, START_CHAR(tty));
|
|
}
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS) {
|
|
/* disable interrupts while setting modem control lines */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
info->mctrl |= TIOCM_RTS;
|
|
info->port->set_mctrl(info->port, info->mctrl);
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
}
|
|
}
|
|
|
|
static int get_serial_info(struct SICC_info *info, struct serial_struct *retinfo)
|
|
{
|
|
struct SICC_state *state = info->state;
|
|
struct SICC_port *port = info->port;
|
|
struct serial_struct tmp;
|
|
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
tmp.type = 0;
|
|
tmp.line = state->line;
|
|
tmp.port = port->uart_base;
|
|
if (HIGH_BITS_OFFSET)
|
|
tmp.port_high = port->uart_base >> HIGH_BITS_OFFSET;
|
|
tmp.irq = port->irqrx;
|
|
tmp.flags = 0;
|
|
tmp.xmit_fifo_size = port->fifosize;
|
|
tmp.baud_base = port->uartclk / 16;
|
|
tmp.close_delay = state->close_delay;
|
|
tmp.closing_wait = state->closing_wait;
|
|
tmp.custom_divisor = state->custom_divisor;
|
|
|
|
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int set_serial_info(struct SICC_info *info,
|
|
struct serial_struct *newinfo)
|
|
{
|
|
struct serial_struct new_serial;
|
|
struct SICC_state *state, old_state;
|
|
struct SICC_port *port;
|
|
unsigned long new_port;
|
|
unsigned int i, change_irq, change_port;
|
|
int retval = 0;
|
|
|
|
if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
|
|
return -EFAULT;
|
|
|
|
state = info->state;
|
|
old_state = *state;
|
|
port = info->port;
|
|
|
|
new_port = new_serial.port;
|
|
if (HIGH_BITS_OFFSET)
|
|
new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
|
|
|
|
change_irq = new_serial.irq != port->irqrx;
|
|
change_port = new_port != port->uart_base;
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
if (change_irq || change_port ||
|
|
(new_serial.baud_base != port->uartclk / 16) ||
|
|
(new_serial.close_delay != state->close_delay) ||
|
|
(new_serial.xmit_fifo_size != port->fifosize) ||
|
|
((new_serial.flags & ~ASYNC_USR_MASK) !=
|
|
(state->flags & ~ASYNC_USR_MASK)))
|
|
return -EPERM;
|
|
state->flags = ((state->flags & ~ASYNC_USR_MASK) |
|
|
(new_serial.flags & ASYNC_USR_MASK));
|
|
info->flags = ((info->flags & ~ASYNC_USR_MASK) |
|
|
(new_serial.flags & ASYNC_USR_MASK));
|
|
state->custom_divisor = new_serial.custom_divisor;
|
|
goto check_and_exit;
|
|
}
|
|
|
|
if ((new_serial.irq >= NR_IRQS) || (new_serial.irq < 0) ||
|
|
(new_serial.baud_base < 9600))
|
|
return -EINVAL;
|
|
|
|
if (new_serial.type && change_port) {
|
|
for (i = 0; i < SERIAL_SICC_NR; i++)
|
|
if ((port != sicc_ports + i) &&
|
|
sicc_ports[i].uart_base != new_port)
|
|
return -EADDRINUSE;
|
|
}
|
|
|
|
if ((change_port || change_irq) && (state->count > 1))
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* OK, past this point, all the error checking has been done.
|
|
* At this point, we start making changes.....
|
|
*/
|
|
port->uartclk = new_serial.baud_base * 16;
|
|
state->flags = ((state->flags & ~ASYNC_FLAGS) |
|
|
(new_serial.flags & ASYNC_FLAGS));
|
|
info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
|
|
(info->flags & ASYNC_INTERNAL_FLAGS));
|
|
state->custom_divisor = new_serial.custom_divisor;
|
|
state->close_delay = msecs_to_jiffies(10 * new_serial.close_delay);
|
|
state->closing_wait = msecs_to_jiffies(10 * new_serial.closing_wait);
|
|
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
|
|
port->fifosize = new_serial.xmit_fifo_size;
|
|
|
|
if (change_port || change_irq) {
|
|
/*
|
|
* We need to shutdown the serial port at the old
|
|
* port/irq combination.
|
|
*/
|
|
siccuart_shutdown(info);
|
|
port->irqrx = new_serial.irq;
|
|
port->uart_base = new_port;
|
|
}
|
|
|
|
check_and_exit:
|
|
if (!port->uart_base)
|
|
return 0;
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
|
if ((old_state.flags & ASYNC_SPD_MASK) !=
|
|
(state->flags & ASYNC_SPD_MASK) ||
|
|
(old_state.custom_divisor != state->custom_divisor)) {
|
|
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
|
info->tty->alt_speed = 57600;
|
|
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
|
info->tty->alt_speed = 115200;
|
|
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
|
info->tty->alt_speed = 230400;
|
|
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
|
info->tty->alt_speed = 460800;
|
|
siccuart_change_speed(info, NULL);
|
|
}
|
|
} else
|
|
retval = siccuart_startup(info);
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*
|
|
* get_lsr_info - get line status register info
|
|
*/
|
|
static int get_lsr_info(struct SICC_info *info, unsigned int *value)
|
|
{
|
|
unsigned int result, status;
|
|
unsigned long flags;
|
|
|
|
/* disable interrupts while reading status from port */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
status = readb(info->port->uart_base + BL_SICC_LSR);
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
result = status & _LSR_TSR_EMPTY ? TIOCSER_TEMT : 0;
|
|
|
|
/*
|
|
* If we're about to load something into the transmit
|
|
* register, we'll pretend the transmitter isn't empty to
|
|
* avoid a race condition (depending on when the transmit
|
|
* interrupt happens).
|
|
*/
|
|
if (info->x_char ||
|
|
((CIRC_CNT(info->xmit.head, info->xmit.tail,
|
|
SICC_XMIT_SIZE) > 0) &&
|
|
!info->tty->stopped && !info->tty->hw_stopped))
|
|
result &= TIOCSER_TEMT;
|
|
|
|
return put_user(result, value);
|
|
}
|
|
|
|
static int get_modem_info(struct SICC_info *info, unsigned int *value)
|
|
{
|
|
unsigned int result = info->mctrl;
|
|
|
|
return put_user(result, value);
|
|
}
|
|
|
|
static int set_modem_info(struct SICC_info *info, unsigned int cmd,
|
|
unsigned int *value)
|
|
{
|
|
unsigned int arg, old;
|
|
unsigned long flags;
|
|
|
|
if (get_user(arg, value))
|
|
return -EFAULT;
|
|
|
|
old = info->mctrl;
|
|
switch (cmd) {
|
|
case TIOCMBIS:
|
|
info->mctrl |= arg;
|
|
break;
|
|
|
|
case TIOCMBIC:
|
|
info->mctrl &= ~arg;
|
|
break;
|
|
|
|
case TIOCMSET:
|
|
info->mctrl = arg;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
/* disable interrupts while setting modem control lines */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
if (old != info->mctrl)
|
|
info->port->set_mctrl(info->port, info->mctrl);
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
return 0;
|
|
}
|
|
|
|
static void siccuart_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
unsigned long flags;
|
|
unsigned int lcr_h;
|
|
|
|
|
|
/* disable interrupts while setting break state */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
lcr_h = readb(info->port + BL_SICC_LSR);
|
|
if (break_state == -1)
|
|
lcr_h |= _LSR_LB_MASK;
|
|
else
|
|
lcr_h &= ~_LSR_LB_MASK;
|
|
writeb(lcr_h, info->port + BL_SICC_LSRS);
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
}
|
|
|
|
static int siccuart_ioctl(struct tty_struct *tty, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
struct SICC_icount cnow;
|
|
struct serial_icounter_struct icount;
|
|
unsigned long flags;
|
|
|
|
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
|
|
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
|
|
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case TIOCMGET:
|
|
return get_modem_info(info, (unsigned int *)arg);
|
|
case TIOCMBIS:
|
|
case TIOCMBIC:
|
|
case TIOCMSET:
|
|
return set_modem_info(info, cmd, (unsigned int *)arg);
|
|
case TIOCGSERIAL:
|
|
return get_serial_info(info,
|
|
(struct serial_struct *)arg);
|
|
case TIOCSSERIAL:
|
|
return set_serial_info(info,
|
|
(struct serial_struct *)arg);
|
|
case TIOCSERGETLSR: /* Get line status register */
|
|
return get_lsr_info(info, (unsigned int *)arg);
|
|
/*
|
|
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
|
|
* - mask passed in arg for lines of interest
|
|
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
|
|
* Caller should use TIOCGICOUNT to see which one it was
|
|
*/
|
|
case TIOCMIWAIT:
|
|
return 0;
|
|
/*
|
|
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
|
|
* Return: write counters to the user passed counter struct
|
|
* NB: both 1->0 and 0->1 transitions are counted except for
|
|
* RI where only 0->1 is counted.
|
|
*/
|
|
case TIOCGICOUNT:
|
|
/* disable interrupts while getting interrupt count */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
cnow = info->state->icount;
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
icount.cts = cnow.cts;
|
|
icount.dsr = cnow.dsr;
|
|
icount.rng = cnow.rng;
|
|
icount.dcd = cnow.dcd;
|
|
icount.rx = cnow.rx;
|
|
icount.tx = cnow.tx;
|
|
icount.frame = cnow.frame;
|
|
icount.overrun = cnow.overrun;
|
|
icount.parity = cnow.parity;
|
|
icount.brk = cnow.brk;
|
|
icount.buf_overrun = cnow.buf_overrun;
|
|
|
|
return copy_to_user((void *)arg, &icount, sizeof(icount))
|
|
? -EFAULT : 0;
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void siccuart_set_termios(struct tty_struct *tty, struct termios *old_termios)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
unsigned long flags;
|
|
unsigned int cflag = tty->termios->c_cflag;
|
|
|
|
if ((cflag ^ old_termios->c_cflag) == 0 &&
|
|
RELEVENT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0)
|
|
return;
|
|
|
|
siccuart_change_speed(info, old_termios);
|
|
|
|
/* Handle transition to B0 status */
|
|
if ((old_termios->c_cflag & CBAUD) &&
|
|
!(cflag & CBAUD)) {
|
|
/* disable interrupts while setting break state */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
info->mctrl &= ~(TIOCM_RTS | TIOCM_DTR);
|
|
info->port->set_mctrl(info->port, info->mctrl);
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
}
|
|
|
|
/* Handle transition away from B0 status */
|
|
if (!(old_termios->c_cflag & CBAUD) &&
|
|
(cflag & CBAUD)) {
|
|
/* disable interrupts while setting break state */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
info->mctrl |= TIOCM_DTR;
|
|
if (!(cflag & CRTSCTS) ||
|
|
!test_bit(TTY_THROTTLED, &tty->flags))
|
|
info->mctrl |= TIOCM_RTS;
|
|
info->port->set_mctrl(info->port, info->mctrl);
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
}
|
|
|
|
/* Handle turning off CRTSCTS */
|
|
if ((old_termios->c_cflag & CRTSCTS) &&
|
|
!(cflag & CRTSCTS)) {
|
|
tty->hw_stopped = 0;
|
|
siccuart_start(tty);
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* No need to wake up processes in open wait, since they
|
|
* sample the CLOCAL flag once, and don't recheck it.
|
|
* XXX It's not clear whether the current behavior is correct
|
|
* or not. Hence, this may change.....
|
|
*/
|
|
if (!(old_termios->c_cflag & CLOCAL) &&
|
|
(tty->termios->c_cflag & CLOCAL))
|
|
wake_up_interruptible(&info->open_wait);
|
|
#endif
|
|
}
|
|
|
|
static void siccuart_close(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
struct SICC_state *state;
|
|
unsigned long flags;
|
|
|
|
if (!info)
|
|
return;
|
|
|
|
state = info->state;
|
|
|
|
//pr_debug("siccuart_close() called\n");
|
|
|
|
/* lock tty->driver_data while closing port */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
|
|
if (tty_hung_up_p(filp)) {
|
|
goto quick_close;
|
|
}
|
|
|
|
if ((tty->count == 1) && (state->count != 1)) {
|
|
/*
|
|
* Uh, oh. tty->count is 1, which means that the tty
|
|
* structure will be freed. state->count should always
|
|
* be one in these conditions. If it's greater than
|
|
* one, we've got real problems, since it means the
|
|
* serial port won't be shutdown.
|
|
*/
|
|
printk("siccuart_close: bad serial port count; tty->count is 1, state->count is %d\n", state->count);
|
|
state->count = 1;
|
|
}
|
|
if (--state->count < 0) {
|
|
printk("rs_close: bad serial port count for %s: %d\n", tty->name, state->count);
|
|
state->count = 0;
|
|
}
|
|
if (state->count) {
|
|
goto quick_close;
|
|
}
|
|
info->flags |= ASYNC_CLOSING;
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
/*
|
|
* Now we wait for the transmit buffer to clear; and we notify
|
|
* the line discipline to only process XON/XOFF characters.
|
|
*/
|
|
tty->closing = 1;
|
|
if (info->state->closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
|
tty_wait_until_sent(tty, info->state->closing_wait);
|
|
/*
|
|
* At this point, we stop accepting input. To do this, we
|
|
* disable the receive line status interrupts.
|
|
*/
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
|
siccuart_disable_rx_interrupt(info);
|
|
/*
|
|
* Before we drop DTR, make sure the UART transmitter
|
|
* has completely drained; this is especially
|
|
* important if there is a transmit FIFO!
|
|
*/
|
|
siccuart_wait_until_sent(tty, info->timeout);
|
|
}
|
|
siccuart_shutdown(info);
|
|
if (tty->driver->flush_buffer)
|
|
tty->driver->flush_buffer(tty);
|
|
if (tty->ldisc.flush_buffer)
|
|
tty->ldisc.flush_buffer(tty);
|
|
tty->closing = 0;
|
|
info->event = 0;
|
|
info->tty = NULL;
|
|
if (info->blocked_open) {
|
|
if (info->state->close_delay)
|
|
schedule_timeout_interruptible(info->state->close_delay);
|
|
wake_up_interruptible(&info->open_wait);
|
|
}
|
|
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
|
|
wake_up_interruptible(&info->close_wait);
|
|
return;
|
|
|
|
quick_close:
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
return;
|
|
}
|
|
|
|
static void siccuart_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
{
|
|
struct SICC_info *info = (struct SICC_info *) tty->driver_data;
|
|
unsigned long char_time, expire;
|
|
|
|
if (info->port->fifosize == 0)
|
|
return;
|
|
|
|
/*
|
|
* Set the check interval to be 1/5 of the estimated time to
|
|
* send a single character, and make it at least 1. The check
|
|
* interval should also be less than the timeout.
|
|
*
|
|
* Note: we have to use pretty tight timings here to satisfy
|
|
* the NIST-PCTS.
|
|
*/
|
|
char_time = (info->timeout - msecs_to_jiffies(20)) / info->port->fifosize;
|
|
char_time = char_time / 5;
|
|
if (char_time == 0)
|
|
char_time = 1;
|
|
|
|
// Crazy!! sometimes the input arg 'timeout' can be negtive numbers :-(
|
|
if (timeout >= 0 && timeout < char_time)
|
|
char_time = timeout;
|
|
/*
|
|
* If the transmitter hasn't cleared in twice the approximate
|
|
* amount of time to send the entire FIFO, it probably won't
|
|
* ever clear. This assumes the UART isn't doing flow
|
|
* control, which is currently the case. Hence, if it ever
|
|
* takes longer than info->timeout, this is probably due to a
|
|
* UART bug of some kind. So, we clamp the timeout parameter at
|
|
* 2*info->timeout.
|
|
*/
|
|
if (!timeout || timeout > 2 * info->timeout)
|
|
timeout = 2 * info->timeout;
|
|
|
|
expire = jiffies + timeout;
|
|
pr_debug("siccuart_wait_until_sent(%d), jiff=%lu, expire=%lu char_time=%lu...\n",
|
|
tty->index, jiffies,
|
|
expire, char_time);
|
|
while ((readb(info->port->uart_base + BL_SICC_LSR) & _LSR_TX_ALL) != _LSR_TX_ALL) {
|
|
schedule_timeout_interruptible(char_time);
|
|
if (signal_pending(current))
|
|
break;
|
|
if (timeout && time_after(jiffies, expire))
|
|
break;
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
}
|
|
|
|
static void siccuart_hangup(struct tty_struct *tty)
|
|
{
|
|
struct SICC_info *info = tty->driver_data;
|
|
struct SICC_state *state = info->state;
|
|
|
|
siccuart_flush_buffer(tty);
|
|
if (info->flags & ASYNC_CLOSING)
|
|
return;
|
|
siccuart_shutdown(info);
|
|
info->event = 0;
|
|
state->count = 0;
|
|
info->flags &= ~ASYNC_NORMAL_ACTIVE;
|
|
info->tty = NULL;
|
|
wake_up_interruptible(&info->open_wait);
|
|
}
|
|
|
|
static int block_til_ready(struct tty_struct *tty, struct file *filp,
|
|
struct SICC_info *info)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct SICC_state *state = info->state;
|
|
unsigned long flags;
|
|
int do_clocal = 0, extra_count = 0, retval;
|
|
|
|
/*
|
|
* If the device is in the middle of being closed, then block
|
|
* until it's done, and then try again.
|
|
*/
|
|
if (tty_hung_up_p(filp) ||
|
|
(info->flags & ASYNC_CLOSING)) {
|
|
if (info->flags & ASYNC_CLOSING)
|
|
interruptible_sleep_on(&info->close_wait);
|
|
return (info->flags & ASYNC_HUP_NOTIFY) ?
|
|
-EAGAIN : -ERESTARTSYS;
|
|
}
|
|
|
|
/*
|
|
* If non-blocking mode is set, or the port is not enabled,
|
|
* then make the check up front and then exit.
|
|
*/
|
|
if ((filp->f_flags & O_NONBLOCK) ||
|
|
(tty->flags & (1 << TTY_IO_ERROR))) {
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
if (tty->termios->c_cflag & CLOCAL)
|
|
do_clocal = 1;
|
|
|
|
/*
|
|
* Block waiting for the carrier detect and the line to become
|
|
* free (i.e., not in use by the callout). While we are in
|
|
* this loop, state->count is dropped by one, so that
|
|
* rs_close() knows when to free things. We restore it upon
|
|
* exit, either normal or abnormal.
|
|
*/
|
|
retval = 0;
|
|
add_wait_queue(&info->open_wait, &wait);
|
|
/* lock while decrementing state->count */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
if (!tty_hung_up_p(filp)) {
|
|
extra_count = 1;
|
|
state->count--;
|
|
}
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
info->blocked_open++;
|
|
while (1) {
|
|
/* disable interrupts while setting modem control lines */
|
|
spin_lock_irqsave(&info->state->sicc_lock,flags);
|
|
if (tty->termios->c_cflag & CBAUD) {
|
|
info->mctrl = TIOCM_DTR | TIOCM_RTS;
|
|
info->port->set_mctrl(info->port, info->mctrl);
|
|
}
|
|
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (tty_hung_up_p(filp) ||
|
|
!(info->flags & ASYNC_INITIALIZED)) {
|
|
if (info->flags & ASYNC_HUP_NOTIFY)
|
|
retval = -EAGAIN;
|
|
else
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
if (!(info->flags & ASYNC_CLOSING) &&
|
|
(do_clocal /*|| (UART_GET_FR(info->port) & SICC_UARTFR_DCD)*/))
|
|
break;
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
schedule();
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&info->open_wait, &wait);
|
|
if (extra_count)
|
|
state->count++;
|
|
info->blocked_open--;
|
|
if (retval)
|
|
return retval;
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
static struct SICC_info *siccuart_get(int line)
|
|
{
|
|
struct SICC_info *info;
|
|
struct SICC_state *state = sicc_state + line;
|
|
|
|
state->count++;
|
|
if (state->info)
|
|
return state->info;
|
|
info = kmalloc(sizeof(struct SICC_info), GFP_KERNEL);
|
|
if (info) {
|
|
memset(info, 0, sizeof(struct SICC_info));
|
|
init_waitqueue_head(&info->open_wait);
|
|
init_waitqueue_head(&info->close_wait);
|
|
init_waitqueue_head(&info->delta_msr_wait);
|
|
info->flags = state->flags;
|
|
info->state = state;
|
|
info->port = sicc_ports + line;
|
|
tasklet_init(&info->tlet, siccuart_tasklet_action,
|
|
(unsigned long)info);
|
|
}
|
|
if (state->info) {
|
|
kfree(info);
|
|
return state->info;
|
|
}
|
|
state->info = info;
|
|
return info;
|
|
}
|
|
|
|
static int siccuart_open(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct SICC_info *info;
|
|
int retval, line = tty->index;
|
|
|
|
|
|
// is this a line that we've got?
|
|
if (line >= SERIAL_SICC_NR) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
info = siccuart_get(line);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
tty->driver_data = info;
|
|
info->tty = tty;
|
|
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
|
|
|
|
/*
|
|
* Make sure we have the temporary buffer allocated
|
|
*/
|
|
if (!tmp_buf) {
|
|
unsigned long page = get_zeroed_page(GFP_KERNEL);
|
|
if (tmp_buf)
|
|
free_page(page);
|
|
else if (!page) {
|
|
return -ENOMEM;
|
|
}
|
|
tmp_buf = (u_char *)page;
|
|
}
|
|
|
|
/*
|
|
* If the port is in the middle of closing, bail out now.
|
|
*/
|
|
if (tty_hung_up_p(filp) ||
|
|
(info->flags & ASYNC_CLOSING)) {
|
|
if (info->flags & ASYNC_CLOSING)
|
|
interruptible_sleep_on(&info->close_wait);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/*
|
|
* Start up the serial port
|
|
*/
|
|
retval = siccuart_startup(info);
|
|
if (retval) {
|
|
return retval;
|
|
}
|
|
|
|
retval = block_til_ready(tty, filp, info);
|
|
if (retval) {
|
|
return retval;
|
|
}
|
|
|
|
#ifdef CONFIG_SERIAL_SICC_CONSOLE
|
|
if (siccuart_cons.cflag && siccuart_cons.index == line) {
|
|
tty->termios->c_cflag = siccuart_cons.cflag;
|
|
siccuart_cons.cflag = 0;
|
|
siccuart_change_speed(info, NULL);
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static struct tty_operations sicc_ops = {
|
|
.open = siccuart_open,
|
|
.close = siccuart_close,
|
|
.write = siccuart_write,
|
|
.put_char = siccuart_put_char,
|
|
.flush_chars = siccuart_flush_chars,
|
|
.write_room = siccuart_write_room,
|
|
.chars_in_buffer = siccuart_chars_in_buffer,
|
|
.flush_buffer = siccuart_flush_buffer,
|
|
.ioctl = siccuart_ioctl,
|
|
.throttle = siccuart_throttle,
|
|
.unthrottle = siccuart_unthrottle,
|
|
.send_xchar = siccuart_send_xchar,
|
|
.set_termios = siccuart_set_termios,
|
|
.stop = siccuart_stop,
|
|
.start = siccuart_start,
|
|
.hangup = siccuart_hangup,
|
|
.break_ctl = siccuart_break_ctl,
|
|
.wait_until_sent = siccuart_wait_until_sent,
|
|
};
|
|
|
|
int __init siccuart_init(void)
|
|
{
|
|
int i;
|
|
siccnormal_driver = alloc_tty_driver(SERIAL_SICC_NR);
|
|
if (!siccnormal_driver)
|
|
return -ENOMEM;
|
|
printk("IBM Vesta SICC serial port driver V 0.1 by Yudong Yang and Yi Ge / IBM CRL .\n");
|
|
siccnormal_driver->driver_name = "serial_sicc";
|
|
siccnormal_driver->owner = THIS_MODULE;
|
|
siccnormal_driver->name = SERIAL_SICC_NAME;
|
|
siccnormal_driver->major = SERIAL_SICC_MAJOR;
|
|
siccnormal_driver->minor_start = SERIAL_SICC_MINOR;
|
|
siccnormal_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
siccnormal_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
siccnormal_driver->init_termios = tty_std_termios;
|
|
siccnormal_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
siccnormal_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
|
|
tty_set_operations(siccnormal_driver, &sicc_ops);
|
|
|
|
if (tty_register_driver(siccnormal_driver))
|
|
panic("Couldn't register SICC serial driver\n");
|
|
|
|
for (i = 0; i < SERIAL_SICC_NR; i++) {
|
|
struct SICC_state *state = sicc_state + i;
|
|
state->line = i;
|
|
state->close_delay = msecs_to_jiffies(500);
|
|
state->closing_wait = 30 * HZ;
|
|
spin_lock_init(&state->sicc_lock);
|
|
}
|
|
|
|
|
|
return 0;
|
|
}
|
|
|
|
__initcall(siccuart_init);
|
|
|
|
#ifdef CONFIG_SERIAL_SICC_CONSOLE
|
|
/************** console driver *****************/
|
|
|
|
/*
|
|
* This code is currently never used; console->read is never called.
|
|
* Therefore, although we have an implementation, we don't use it.
|
|
* FIXME: the "const char *s" should be fixed to "char *s" some day.
|
|
* (when the definition in include/linux/console.h is also fixed)
|
|
*/
|
|
#ifdef used_and_not_const_char_pointer
|
|
static int siccuart_console_read(struct console *co, const char *s, u_int count)
|
|
{
|
|
struct SICC_port *port = &sicc_ports[co->index];
|
|
unsigned int status;
|
|
char *w;
|
|
int c;
|
|
|
|
pr_debug("siccuart_console_read() called\n");
|
|
|
|
c = 0;
|
|
w = s;
|
|
while (c < count) {
|
|
if(readb(port->uart_base + BL_SICC_LSR) & _LSR_RBR_FULL) {
|
|
*w++ = readb(port->uart_base + BL_SICC_RBR);
|
|
c++;
|
|
} else {
|
|
// nothing more to get, return
|
|
return c;
|
|
}
|
|
}
|
|
// return the count
|
|
return c;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Print a string to the serial port trying not to disturb
|
|
* any possible real use of the port...
|
|
*
|
|
* The console_lock must be held when we get here.
|
|
*/
|
|
static void siccuart_console_write(struct console *co, const char *s, u_int count)
|
|
{
|
|
struct SICC_port *port = &sicc_ports[co->index];
|
|
unsigned int old_cr;
|
|
int i;
|
|
|
|
/*
|
|
* First save the CR then disable the interrupts
|
|
*/
|
|
old_cr = readb(port->uart_base + BL_SICC_TxCR);
|
|
writeb(old_cr & ~_TxCR_DME_MASK, port->uart_base + BL_SICC_TxCR);
|
|
|
|
/*
|
|
* Now, do each character
|
|
*/
|
|
for (i = 0; i < count; i++) {
|
|
while ((readb(port->uart_base + BL_SICC_LSR)&_LSR_TX_ALL) != _LSR_TX_ALL);
|
|
writeb(s[i], port->uart_base + BL_SICC_TBR);
|
|
if (s[i] == '\n') {
|
|
while ((readb(port->uart_base + BL_SICC_LSR)&_LSR_TX_ALL) != _LSR_TX_ALL);
|
|
writeb('\r', port->uart_base + BL_SICC_TBR);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Finally, wait for transmitter to become empty
|
|
* and restore the TCR
|
|
*/
|
|
while ((readb(port->uart_base + BL_SICC_LSR)&_LSR_TX_ALL) != _LSR_TX_ALL);
|
|
writeb(old_cr, port->uart_base + BL_SICC_TxCR);
|
|
}
|
|
|
|
/*
|
|
* Receive character from the serial port
|
|
*/
|
|
static int siccuart_console_wait_key(struct console *co)
|
|
{
|
|
struct SICC_port *port = &sicc_ports[co->index];
|
|
int c;
|
|
|
|
while(!(readb(port->uart_base + BL_SICC_LSR) & _LSR_RBR_FULL));
|
|
c = readb(port->uart_base + BL_SICC_RBR);
|
|
return c;
|
|
}
|
|
|
|
static struct tty_driver *siccuart_console_device(struct console *c, int *index)
|
|
{
|
|
*index = c->index;
|
|
return siccnormal_driver;
|
|
}
|
|
|
|
static int __init siccuart_console_setup(struct console *co, char *options)
|
|
{
|
|
struct SICC_port *port;
|
|
int baud = 9600;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
u_int cflag = CREAD | HUPCL | CLOCAL;
|
|
u_int lcr_h, quot;
|
|
|
|
|
|
if (co->index >= SERIAL_SICC_NR)
|
|
co->index = 0;
|
|
|
|
port = &sicc_ports[co->index];
|
|
|
|
if (port->uart_base == 0)
|
|
port->uart_base = (int)ioremap(port->uart_base_phys, PAGE_SIZE);
|
|
|
|
if (options) {
|
|
char *s = options;
|
|
baud = simple_strtoul(s, NULL, 10);
|
|
while (*s >= '0' && *s <= '9')
|
|
s++;
|
|
if (*s) parity = *s++;
|
|
if (*s) bits = *s - '0';
|
|
}
|
|
|
|
/*
|
|
* Now construct a cflag setting.
|
|
*/
|
|
switch (baud) {
|
|
case 1200: cflag |= B1200; break;
|
|
case 2400: cflag |= B2400; break;
|
|
case 4800: cflag |= B4800; break;
|
|
default: cflag |= B9600; baud = 9600; break;
|
|
case 19200: cflag |= B19200; break;
|
|
case 38400: cflag |= B38400; break;
|
|
case 57600: cflag |= B57600; break;
|
|
case 115200: cflag |= B115200; break;
|
|
}
|
|
switch (bits) {
|
|
case 7: cflag |= CS7; lcr_h = _LCR_PE_DISABLE | _LCR_DB_7_BITS | _LCR_SB_1_BIT; break;
|
|
default: cflag |= CS8; lcr_h = _LCR_PE_DISABLE | _LCR_DB_8_BITS | _LCR_SB_1_BIT; break;
|
|
}
|
|
switch (parity) {
|
|
case 'o':
|
|
case 'O': cflag |= PARODD; lcr_h |= _LCR_PTY_ODD; break;
|
|
case 'e':
|
|
case 'E': cflag |= PARENB; lcr_h |= _LCR_PE_ENABLE | _LCR_PTY_ODD; break;
|
|
}
|
|
|
|
co->cflag = cflag;
|
|
|
|
|
|
{
|
|
// a copy of is inserted here ppc403SetBaud(com_port, (int)9600);
|
|
unsigned long divisor, clockSource, temp;
|
|
unsigned int rate = baud;
|
|
|
|
/* Ensure CICCR[7] is 0 to select Internal Baud Clock */
|
|
powerpcMtcic_cr((unsigned long)(powerpcMfcic_cr() & 0xFEFFFFFF));
|
|
|
|
/* Determine Internal Baud Clock Frequency */
|
|
/* powerpcMfclkgpcr() reads DCR 0x120 - the*/
|
|
/* SCCR (Serial Clock Control Register) on Vesta */
|
|
temp = powerpcMfclkgpcr();
|
|
|
|
if(temp & 0x00000080) {
|
|
clockSource = 324000000;
|
|
}
|
|
else {
|
|
clockSource = 216000000;
|
|
}
|
|
clockSource = clockSource/(unsigned long)((temp&0x00FC0000)>>18);
|
|
divisor = clockSource/(16*rate) - 1;
|
|
/* divisor has only 12 bits of resolution */
|
|
if(divisor>0x00000FFF){
|
|
divisor=0x00000FFF;
|
|
}
|
|
|
|
quot = divisor;
|
|
}
|
|
|
|
writeb((quot & 0x00000F00)>>8, port->uart_base + BL_SICC_BRDH );
|
|
writeb( quot & 0x00000FF, port->uart_base + BL_SICC_BRDL );
|
|
|
|
/* Set CTL2 reg to use external clock (ExtClk) and enable FIFOs. */
|
|
/* For now, do NOT use FIFOs since 403 UART did not have this */
|
|
/* capability and this driver was inherited from 403UART. */
|
|
writeb(_CTL2_EXTERN, port->uart_base + BL_SICC_CTL2);
|
|
|
|
writeb(lcr_h, port->uart_base + BL_SICC_LCR);
|
|
writeb(_RCR_ER_ENABLE | _RCR_PME_HARD, port->uart_base + BL_SICC_RCR);
|
|
writeb( _TxCR_ET_ENABLE , port->uart_base + BL_SICC_TxCR);
|
|
|
|
// writeb(, info->port->uart_base + BL_SICC_RCR );
|
|
/*
|
|
* Transmitter Command Register: Transmitter enabled & DMA + TBR interrupt
|
|
* + Transmitter Empty interrupt + Transmitter error interrupt disabled &
|
|
* Stop mode when CTS active enabled & Transmit Break + Pattern Generation
|
|
* mode disabled.
|
|
*/
|
|
|
|
writeb( 0x00, port->uart_base + BL_SICC_IrCR ); // disable IrDA
|
|
|
|
readb(port->uart_base + BL_SICC_RBR);
|
|
|
|
writeb(0xf8, port->uart_base + BL_SICC_LSR); /* reset bits 0-4 of LSR */
|
|
|
|
/* we will enable the port as we need it */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct console siccuart_cons =
|
|
{
|
|
.name = SERIAL_SICC_NAME,
|
|
.write = siccuart_console_write,
|
|
#ifdef used_and_not_const_char_pointer
|
|
.read = siccuart_console_read,
|
|
#endif
|
|
.device = siccuart_console_device,
|
|
.wait_key = siccuart_console_wait_key,
|
|
.setup = siccuart_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
void __init sicc_console_init(void)
|
|
{
|
|
register_console(&siccuart_cons);
|
|
}
|
|
|
|
#endif /* CONFIG_SERIAL_SICC_CONSOLE */
|